java.lang.NoSuchFieldError: CHAT
at pixelmon.client.gui.GuiChatOverlay.eventHandler(GuiChatOverlay.java:23)
at net.minecraftforge.event.ASMEventHandler_7_GuiChatOverlay_eventHandler_Pre.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraftforge.event.EventBus.post(EventBus.java:108)
at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:861)
at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:102)
at net.minecraft.client.renderer.EntityRenderer.func_78480_b(EntityRenderer.java:1014)
at net.minecraft.client.Minecraft.func_71411_J(Minecraft.java:944)
at net.minecraft.client.Minecraft.func_99999_d(Minecraft.java:836)
at net.minecraft.client.main.Main.main(SourceFile:101)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:131)
at net.minecraft.launchwrapper.Launch.main(Launch.java:27)

A detailed walkthrough of the error, its code path and all known details is as follows:
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-- Head --
Stacktrace:
at pixelmon.client.gui.GuiChatOverlay.eventHandler(GuiChatOverlay.java:23)
at net.minecraftforge.event.ASMEventHandler_7_GuiChatOverlay_eventHandler_Pre.invoke(.dynamic)
at net.minecraftforge.event.ASMEventHandler.invoke(ASMEventHandler.java:39)
at net.minecraftforge.event.EventBus.post(EventBus.java:108)
at net.minecraftforge.client.GuiIngameForge.pre(GuiIngameForge.java:861)
at net.minecraftforge.client.GuiIngameForge.func_73830_a(GuiIngameForge.java:102)